气候变化领域集成服务门户(CCPortal): Footprints of marine reptiles from the Middle Triassic (Anisian-Ladinian) Guanling Formation of Guizhou Province; southwestern China: The earliest evidence of synchronous style of swimming

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DOI	10.1016/j.palaeo.2020.109943
	Footprints of marine reptiles from the Middle Triassic (Anisian-Ladinian) Guanling Formation of Guizhou Province; southwestern China: The earliest evidence of synchronous style of swimming
	Xing L.; Klein H.; Lockley M.G.; Wu X.-C.; Benton M.J.; Zeng R.; Romilio A.
发表日期	2020
ISSN	0031-0182
卷号	558
英文摘要	Subaqueously-registered trackways of marine tetrapods are only rarely preserved; some of the best examples so far come from the Shizishan Member (Member II) of the Guanling Formation (Middle Triassic, Anisian-Ladinian) of Yunnan Province in southwestern China. The unit is well-known for the Luoping Biota including abundant skeletons of marine reptiles. The described footprints consist of impressions of fin-like autopodia comprising numerous broad trackways that have been named Dikoposichnus luopingensis and interpreted as having been made by foraging nothosaurs. Morphologically identical tracks and trackways have now been discovered near the city of Anshun in Guizhou Province, in slightly older strata and on a large surface of argillaceous dolostone belonging to the Songzikan Member (Member I) of the Guanling Formation. Additionally, a second morphotype is abundant on the same surface, with long trackways that show semi-plantigrade to plantigrade foot imprints with four distinct digit impressions. All tracks are similar in shape and positioned symmetrically, in broad trackways on either side of the trackway midline. Based on several unique features this morphotype is assigned here to the new ichnotaxon Anshunpes aquacursor ichnogen. nov. ichnosp. nov. It is interpreted as the trackway of a buoyant and punting tetrapod, using its forefeet only. The trackmaker is inferred to be similar to some diapsid placodonts and saurosphargids whose skeletons have been found in the Guanling Formation (Middle Triassic, Anisian-Ladinian) and in the overlying Falang Formation (Middle–Upper Triassic, Ladinian–Carnian). Comparative measurements of trackways and skeletons support this. Additional associated ichnofossils are enigmatic traces such as isolated large oval impressions and cord-like knobby structures. The palaeoenvironment was a shallow near-coast marine habitat, possibly a lagoon. The ichnofauna from Anshun is important, because it is the first record of subaqueous progression activity by marine diapsid placodonts and/or saurosphargids, and also indicates the early adoption of a synchronous style of swimming by marine reptiles. © 2020 Elsevier B.V.
英文关键词	Anshunpes; Dikoposichnus; Nothosaurs; Placodonts; Saurosphargids; Tetrapod tracks
语种	英语
scopus关键词	footprint; morphotype; preservation; reptile; skeleton; swimming; tetrapod; trackway; Triassic; Reptilia; Sauria; Tetrapoda
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150343
作者单位	State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, 100083, China; Shandong Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology, Qiaodiao, 266590, China; Saurierwelt Paläontologisches Museum, Alte Richt 7, Neumarkt, D-92318, Germany; Dinosaur Trackers Research Group, CB 172, University of Colorado at Denver, PO Box 173364, Denver, CO 80217-3364, United States; Canadian Museum of Nature, P.O. Box 3443, Station ‘D, Ottawa, ON K1P 6P4, Canada; School of Earth Sciences, University of Bristol, 24 Tyndall Avenue, Bristol, BS8 1TQ, United Kingdom; Guizhou Provincial Museum, Guiyang, 550001, China; School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
推荐引用方式 GB/T 7714	Xing L.,Klein H.,Lockley M.G.,et al. Footprints of marine reptiles from the Middle Triassic (Anisian-Ladinian) Guanling Formation of Guizhou Province; southwestern China: The earliest evidence of synchronous style of swimming[J],2020,558.
APA	Xing L..,Klein H..,Lockley M.G..,Wu X.-C..,Benton M.J..,...&Romilio A..(2020).Footprints of marine reptiles from the Middle Triassic (Anisian-Ladinian) Guanling Formation of Guizhou Province; southwestern China: The earliest evidence of synchronous style of swimming.Palaeogeography, Palaeoclimatology, Palaeoecology,558.
MLA	Xing L.,et al."Footprints of marine reptiles from the Middle Triassic (Anisian-Ladinian) Guanling Formation of Guizhou Province; southwestern China: The earliest evidence of synchronous style of swimming".Palaeogeography, Palaeoclimatology, Palaeoecology 558(2020).